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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08a334ea0c5d86d8cc9f17e3755e00542b5f3f08cdd6d3ef108b2def030477d' 
  AND token = 'qysfcvQYQWDTYz1qAT8DkHHTz/Uw8JWOF66HAy5baAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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