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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc00f9b0d79ab473c948ec8a82d8ecd104cf221dcb33762b328bb4af388a10e' 
  AND token = 'ISNVSEViIY2F5MjVAbUGL0Byd2dIr2AqpUcFfFfkzhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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