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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4049daa84190106bc4a89b3de757551ca4794e9e69f011102f275a8d3370cd37' 
  AND token = 'jY3XATKivn1YCEtYZOfPHx98ZRaertdDp+auic/wSig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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