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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf8aa112b430f8203353c9309bfcb20a3b16383f789270346fe72d65ea86a39' 
  AND token = 'd6+24D3sfbj8vYu7tgNFAwl+2XbAe4OefURvVWaN5Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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