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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abdc35c74e6e6a5c1f5cfdd430b9b1d7e275ce0d5b6250148647521dc40ac818' 
  AND token = '0Xab4zty4ASu2xoXNbkD3/xbHAWs69uoVVcdYskwBx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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