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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8755ae4ff623e185c418c5c15f617ccc5505f6ade57f26f5151621109199d2' 
  AND token = 'HSwfJxE6IQTR/r9kgJv7/hlGyKBRYToG62fNm9M8fM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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