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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fac09eea3bdae130b5636ff3d5ce8b9a5e80b1ab2d57d8cfbf93269f8670302' 
  AND token = 'oYIw8aMldIqfmzJW1JNnq4iZnUGfGYy0fX4NYtYO6tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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