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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36262d049f4fe622c0f081ed6e38d071281bed9f4a900138829f5604b9895b21' 
  AND token = 'wtaJJ4tzhmLN1JkXnaor3QjxmK1LI7K4u0gZOJaXur4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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