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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ded4b56027cce0e63d3b7e3a03a539ad5bd432aba6d85fd22a7e9a11d5bf8a9a' 
  AND token = '2vsFB+B09OvlvJEMpWIe1GggxQGtVcEhx5HiKhOol/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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