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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98229f1461f1d05453b8f9a410c033d78d78713ddcf91245a2d0b46c74ad677f' 
  AND token = 'reCfjMilD0lsxX+cqZR98EcSHU1YYm78n3ZxQ6DtX/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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