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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a5dff03562435629a64f3225ad87b8c5ec19e128f111991d129272c4f98c8f' 
  AND token = 'vh2n70VnfGrrt0Nk8VYsauqaug4v2j9RVp1175ekPDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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