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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86be5d0325b4c572352baf4546a502d24bc85fd8020bb834e3c9c121ee234922' 
  AND token = 'J3tU3m/OQJMIw83TcJOBty0BEUWpoQ/q81eEyx0bsqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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