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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2faa542e3ce62d351c3ca40484b7929b44f6911dc10d65d8e561674342ba8236' 
  AND token = 'h/293eVSjSlZjU3M5Ow3WHWDMy9TVE3TJnV4vZcEk/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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