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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7567a3cc6aad56c353fee2570e4941cfc00b6d3b2daec146671de99c6b2829' 
  AND token = 'j6zeldo4yVd2JAmbPz3ijvRF7Oevdm9r1mXKpIFoQx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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