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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc31eb39731a61a6a308a8c5ccc5912d9738fe848df92af6a82cb834a7678b9' 
  AND token = 'hUzR6Zz8XsvGVpr4CubaL2q5rk4OWoEd0w9r1Jq8aeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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