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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e986b0fa0cc65af604968d1db00ac655fe08c1441056bd6653632193a1a91f1e' 
  AND token = 'ssZobxoZ8fFlGtPNM4dHuER9Kjg4TwbIB7LUgKFVNhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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