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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16fb839441c6696dce402f7559b7b8f722b2b2338cf3cfb5c126ac75a7fe30b6' 
  AND token = 'Hs9CCZbeq03UpahmuIPao0RgK1qimEPt7Qkk290gKk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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