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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e4466890b5b9e32277b7a6c2cbc639069fb9e0c0882d47f546e6bed296f8f09' 
  AND token = 'ZWcsrsqPBSi/CnPfGGpAH/kw8PN/s5ybcf57bDvS74A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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