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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5843faea543730c5b31f7349e72951659fd2c3ad467cb22ead1823986962aa93' 
  AND token = 'qEJCZ6YU6CH2+WCyy3s8DG1OoKVafT2E2FyVDZYO1nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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