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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e909e6683b2b70d3f63b2bc00e8a7b9541a895076b04a98d7d4229a51fddf35' 
  AND token = 'Jv/cy6c8Cc71CZGLQ9b7qZbO6JhkF5VT31N8jEFLhVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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