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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008eccf267d77b2dacd971953e8278e25ddd9dfb31c5b87e246e237b09367c93' 
  AND token = '9lmSln0C6DUiIyvbuUJk1O4jSZmIAv+tIjVW7Fu/CgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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