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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5d13131057fd1586202788ccbbbeb62a97620aa61481a76277c60a2e611a70' 
  AND token = 'LFjA8jQHNJSxf06+FCgQh17RVJFJjVFmgjnyJVhP2ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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