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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a496d95504d6fc7cb38d811d4b3b743f5c6ec1c6393a7c5507243b872ac73872' 
  AND token = 'FSc7HN12ZF5xqKP37beMZHnvPvkk+9uPkfjmV67pI6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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