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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ed8bc111e1ac4338eb50706ce11b2673c3605ad56235d1a08aba0a39cd7159' 
  AND token = 'koJqye3zlc3wouX3qmOd4n2k6nPNZOdJSIEUmRf9n+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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