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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9c124089a04eda4b164948666f90ef1583c58be7e75dbfbc649ea2b01e6cb4' 
  AND token = '7fod8qJQAGqlKjNFjnwoTrtYvOdTDb2YqODnZbv9gEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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