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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9f048a3547b6530c6f07c1c0c26ca4f7abad9d6753ee1645e93d9c4436cf56' 
  AND token = '1BcRzVIr0BaGlqgDv2FnXwsR9CscBT33pwoaKDCvd7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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