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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa223b10dda0b3e07aca22178b7f41e29b4486aadfec8a8e4a6efd02eda8b59' 
  AND token = 'VYgHdWPba6bbpPd5ghcIBqFKs7FFUHllsi87hO5ohX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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