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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b3e0bd2d81c61d08bd39aa7e7b517aa8467863fb0ade6493a155a407b8f97a' 
  AND token = 'zpxLOsyy+EOndRoyf0DvmW/uwiuzocSqETQxGRv4KIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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