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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969d77f9cf8f427b078504f761b91b240a76c641b9d1aa265e3223dc108fda93' 
  AND token = 'Hdz+kRXa8zdLjYyg+3C265V0PONHsCNJ8p09woAP2zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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