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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c00e0761a1bed8d7961313e317e9109254a3f73f707eafc02c9ca2536e4ca6' 
  AND token = 'JbdYWVd068ntuhehdJt0V8/O9qinnPj4KE9AzgA5KgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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