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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b054424795ca80253252dc63f44d65b4a329cc8559b55071ec487650ec32cd8' 
  AND token = 'n4CRqV5PWB44jqB8HYIfq8DEPxiIuVLs2EOLxEKlz40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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