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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719cb76d8360adabb8b7099a88f5df563dcb88691b38d67b9007ef8137ec1515' 
  AND token = '2Q/g1iY4XmgvNb1ronsQx5wNkFquzKuCgdx9xIuFIcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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