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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7817baee6a55f2b3b0fefed32447ee9cbf8da9843471ffb14b3d4baea323eb79' 
  AND token = 'ydu/tN78D2656EvlbkRT8i8Bhm01+eeOjk456D3jm+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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