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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16689e3ab26a68336eb8db4d045003c0322e6a33fdddfa9243fe3a9318c5aaff' 
  AND token = 'xKehTk9zXfyscD9T9Xg2gUaPaSIKa5btInqgYVivh6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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