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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a7e42d899db55cc99c1c7d2d4f2398599ba69e2d1f117e22ba14ecc2fc1d220' 
  AND token = '36QWd24sscVhshmMXDYJYJRs5BntZMcOFiXk2KWc5Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00145

JSON explain

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