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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3472f89d8c9eaf031109ca3567d4681207b91e4e100a385193f2e68d6c49143a' 
  AND token = '1eJpJMAR3XuBLpsVREuzVZ0MNUztzBfxnPkvtIyt8/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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