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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdfffdd4cc318a6fa5da24224f8deec027137e3b8de7f96df5ce40105fa8004d' 
  AND token = 'mDXLoM7eM5V7BhcCjCR+FPXwwP90bYBMljEJrnMejzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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