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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd59d3da7f308636df40a32f238e49be050d0e18b8530907911382fc5508e05e3' 
  AND token = 'SgAagIJKM2TSVbbFxgQpyY4ssjHLaCZs+Mpo82nUxOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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