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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c147b0d84faa6753b0d78aae334d65979cbec13236df0580f6f05940714db3eb' 
  AND token = '9LibwbTCNynOL6trlfWCnfTsheKcKp9O5d7EY4bw3Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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