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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65dc7c1eb5e16804740597baf211ae8120660a77a513ae2b94ecce0b5d1e0100' 
  AND token = 'uiMVM9dohzbQrQDVclSUBA9b0BzF2w4N2WymIuUD9O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}