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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec01b35fa30926142a790d08c4ca819c3cc3401f44f65ab69594aacd662cca7' 
  AND token = 'TAYIQZCQFgl4F2VMFxa5SCWFF2BkC/XNOA/9lXd2YmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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