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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba94829350f1d62fa19d081dac6c94ed54c6c92a17a1cf62fdb93a6c6e575dcd' 
  AND token = '2krwXWcJU7u/QMtrtAiG9vdRWm+oJXzMMwv+E43Kn8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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