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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eaa21f57d6ebdfdae31f9fecc5369b129b231b2c523f128db7c66b86685c652' 
  AND token = 'velWSk8Z0mPwjS9H8QuXsPwErsQ6Xpvs2LbLdO++3LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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