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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd872ce20e993fe66d77852dae1e5dfb5a2b4fe87a9c0de557ecedba3e291921b' 
  AND token = 'qwbt47Fyvw2Zyj7aGCqyV/Nk9BsDlyJjkxvq7CNsm9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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