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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d5485e5ca0da525b7892267fbafaef4c739eeab23ee60b1105a7f915bacecd' 
  AND token = 'N2vc2VJa3TXcJ+UmCRO0d8S0+0MCbQvrZXy40uuW4ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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