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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb6f97a9edb2e12aed786e07dea3fe4fea72e61ea4d61cb78bc0fc16ae52aef' 
  AND token = 'p00h7obFCgszY0mx2956uH447rJTY0K412m6VtfqmAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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