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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad1742fc3d3ac655e46ec1bca6bc7d63226e82a5fd2dda886fd5449e9e87482e' 
  AND token = 'owARH/Q0cJbP65p2jUGic5vHtxE1rcO58Sztf1VrbKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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