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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c17d12e28864c27802864bdc735ec926db30d5181fc0417fd5aeacb176d034' 
  AND token = '3sdk9so3Xncom9ad3DLGAcWEQ0/lBTxbaTzHZzuO0AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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