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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325c567c71ecbac9e45b96431f05cbf5345f0451815d12154fdd6cccb3906892' 
  AND token = '3UWSzme7Z82xq5EtosYMrA1HbTpW0P+tO5MXCqklbWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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