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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd906be6aceaf7f719c7cd3eb5669873727e82613df911163e7bef77c25de8e61' 
  AND token = 'lh9VVVuk+Y0T0d/tTmPISt8hCaCPF9F8CTB/kBnZN8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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