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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ffc17b30b87773e25ab54585870b8c7d7022c800ae72b725f6bd9b3a3a3c736' 
  AND token = '3DNJmsYnwg5zORkGnQFeyGsNOKlT9/YSQSYdHVP+C9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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