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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54abe7fb2e1140541aea6244fb4741b2e9aefc54014f0bef4ed8aa0a932b4aa4' 
  AND token = 'juKaztOn3+8QuGnm28TAf44F8+0HXc+0ykoscRHesHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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