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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c1c203d0f03367421a38ed46c619778c2e22598c5f41180123c01fce0ea312' 
  AND token = 'Ryoes3Y0XPxmINZsWNB3AKQ0EzxFwgqPfs5MnvJvp40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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