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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b95b3b8e94311aa077f63d1c5e7c9703c05be8bc04ba825136cacf68a7e64c5' 
  AND token = '2AUqcyWk0IGA/LECD/oVLsEoZwn8QdhrNuH89rdbZBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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