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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f711e6e99fbe8cbd9ea5254d68f908cdc3f0c7296268fb670dd2d6c1de47965' 
  AND token = 'WgZfSf5P+A/+OYKfE8mSE7qkjkxcoF+Ai4N+U9cnqGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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