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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad326d027317b9ad1c07b315470f983ee9db1b8d06b5b226218ea0f109120f5' 
  AND token = 'c4MSOC622qdia0RmyYmCiZ0bm+mJk9RMJEATa6SL4SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00251

JSON explain

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