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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f296e8390df8a5cd324302d96a55e232373c430373ee74ec5f320d37192f83cd' 
  AND token = 'ldZ4SMrddrP9WWVGt1HEwO4nOj7ETODk5/v9qqOE9Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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