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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f864678cf0e4a9c48b6b064f0d07c3063fc33ff5fd5a406a708aa0b81a857691' 
  AND token = 'ZQLs1Bkc5z2TRE2AS4uIN5ti/p7WiXqFx5JGQWH7uXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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