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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97d2478547db3034eea10e8948793d38b8d23be7d5add6b796b57df42761deb' 
  AND token = '/YnxY/yKOzYeJckyTSV92rykf2LTHeRLFC8Wrzuo8Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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