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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2703f4d21acd0251c9f11e1277b02e6d8ef910bb457b5404855e5b5bdec6c59e' 
  AND token = 'xCOKg7K8KUg3YUSjuWUSoBIJsgQTw/ckiU+evZ6/2O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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