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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86b51b5dbbb1d1ae09e5d189bfe6fd2adf898a1b9584408d0b85bde96a2dbd44' 
  AND token = 'DT/xNxtdQ3qW+1MStVe7l3UuIXyJrQa8j5iUGP7RnYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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